Chrno
Dreadlord

But do they have data showing how much fun players are having? Because surely that's what counts. You could have a game where only 1% of players can do the top raid but still everybody's having fun, and you could have a game where 100% of the players see everything but they're all bored and whining and quitting. Fun can't be quantified with straight-up data, and trying to use statistics to measure fun is a dangerous logical minefield.